ICOM IC-900 Out of Band Modifications
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BAND .............OPERATING FREQ ................MATRIX CIRCUIT LOCATION .................CONDITION
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28 Mhz .....................28 - 40 Mhz .................................Remove D33 (3-B) ................................RX Only
.....................................................................................Remove D33 (3-B) & ...............................TX/RX
........................................................................................Install Diode at 3-A
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50 Mhz...................... 40 - 54 Mhz ...................................Remove D32 (4-B) ................................RX Only
.......................................................................................... Remove D32 (4-B) &............................. TX/RX
.......................................................................................... Install Diode at 4-A
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144 Mhz ...................138 - 174 Mhz.................................. Remove D27 (1-D) ................................RX Only
........................................................................................... Remove D27 (1-D) &............................. TX/RX
...........................................................................................Install Diode at 1-C
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220 Mhz ....................216 - 236 Mhz ................................Remove D26 (2-D) .................................RX Only
...........................................................................................Remove D26 (2-D) &.............................. TX/RX
.......................................................................................... Install Diode at 2-C
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440 Mhz ..................420 - 470 Mhz ....................................Remove D25 (3-B) .................................RX Only
.............................................................................................Remove D25 (3-B) &............................... TX/RX
.............................................................................................Install Diode at 3-C
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Diodes are 1SS-211 or any high quality silicon signal diode
Matrix is located at display-B of EX-601 remote controller.
4...D36 D32 D28 D24 D20 D16 D12 D8
3...D37 D33 D29 D25 D21 D17 D13 D9
2...D38 D34 D30 D26 D22 D18 D14 D10
1...D39 D35 D31 D27 D23 D19 D15 D11
.......A.... B.... C.... D..... E.... F.... G.... H